本文選題：超前小導(dǎo)管注漿 + FLAC3D　； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：淺埋暗挖法施工時(shí),軟弱圍巖因其強(qiáng)度低、抗擾動(dòng)能力差,通常需要在開(kāi)挖前對(duì)掌子面上方巖層進(jìn)行超前支護(hù),而超前小導(dǎo)管注漿具有操作簡(jiǎn)便、造價(jià)較低、防水加固效果好等優(yōu)勢(shì),是適用性較廣的一種方法。但目前超前小導(dǎo)管注漿的參數(shù)設(shè)計(jì)主要以施工經(jīng)驗(yàn)為主,對(duì)其作用機(jī)理、模擬參數(shù)的等效計(jì)算等方面研究尚不明確和深入。針對(duì)目前超前小導(dǎo)管注漿研究中存在的不足,本文從超前小導(dǎo)管注漿的加固作用機(jī)理、Flac3D模擬超前小導(dǎo)管和注漿加固圈、超前小導(dǎo)管注漿的施工參數(shù)設(shè)計(jì)四個(gè)方面進(jìn)行研究,重點(diǎn)對(duì)Flac3D模擬超前小導(dǎo)管和注漿加固圈的作用機(jī)理、各參數(shù)對(duì)圍巖沉降的影響兩個(gè)方面進(jìn)行了研究,得出的結(jié)論如下:(1)當(dāng)外插角15o時(shí),建議采用Beam單元模擬小導(dǎo)管,外插角15o時(shí),建議采用Cable單元模擬。Beam導(dǎo)管群的Fx最大,且呈對(duì)稱分布,是Fy、Fz的102左右,彎矩Mx很小,可忽略不計(jì);Fy與Fz、My與Mz的值相差不大,且最大值均發(fā)生在隧道的拱腰部位;Cable單元的軸向應(yīng)力和水泥漿應(yīng)力均呈對(duì)稱分布,且受力較均勻。(2)Beam單元模擬導(dǎo)管時(shí),除了其長(zhǎng)度,其余參數(shù)均與圍巖沉降差值呈正比關(guān)系,其影響由大到小依次為:外插角度、導(dǎo)管間距、導(dǎo)管直徑;Cable單元模擬時(shí),各參數(shù)影響由大到小依次為:導(dǎo)管布置范圍、外插角度、導(dǎo)管長(zhǎng)度、布置間距、導(dǎo)管直徑。(3)等效加固圈的E、c、φ、t值與圍巖沉降差值呈正比關(guān)系,其中,E的增長(zhǎng)在c、φ提高的前提下,對(duì)圍巖沉降的控制明顯;c、φ的提高都有其上限值,分別為0.2MPa和45o;泊松比的變化對(duì)圍巖沉降的影響不大,可以忽略。(4)對(duì)沉降差值與小導(dǎo)管、加固圈各參數(shù)的關(guān)系公式進(jìn)行隧道的跨度和埋深修正,將各關(guān)系公式通過(guò)C語(yǔ)言編入程序,該程序可根據(jù)用戶輸入需要控制的沉降差值?z,求出相關(guān)的超前支護(hù)設(shè)計(jì)參數(shù),計(jì)算應(yīng)用方便快捷。將本文的研究成果應(yīng)用于實(shí)際工程,驗(yàn)證了應(yīng)用程序的可靠性,可為超前小導(dǎo)管注漿的各參數(shù)的設(shè)計(jì)及施工方案的確定提供參考和設(shè)計(jì)依據(jù)。
[Abstract]:In shallow underground excavation construction, the weak surrounding rock usually needs to support the rock layer above the face before excavation because of its low strength and poor anti-disturbance ability, but the grouting of the leading small pipe is easy to operate, and the cost is relatively low. Waterproofing and reinforcement effect is good and so on, it is a method of wide applicability. However, at present, the design of grouting parameters of leading small ducts is mainly based on construction experience, so the research on its action mechanism and equivalent calculation of simulation parameters is not clear and thorough. In view of the shortcomings of the present research on the advance small pipe grouting, this paper studies the reinforcement mechanism of the leading small pipe grouting from four aspects: the Flac3D simulation of the leading small pipe and the grouting reinforcement ring, and the design of the construction parameters of the leading small pipe grouting. This paper focuses on the mechanism of Flac3D simulation leading small ducts and grouting reinforcement rings, and the influence of each parameter on the settlement of surrounding rock. The conclusions are as follows: 1) when the extrapolation angle is 15o, it is suggested that the Beam element be used to simulate the small ducts. When the extrapolation angle is 15o, it is suggested that the Cable element be used to simulate the maximum FX of the .beam catheter group, which is about 102 of the FY Fz, and the bending moment Mx is very small, so the difference between Fy and FZM y and Mz is negligible. The maximum values occur in both axial stress and cement slurry stress of cable element at the arch waist of tunnel, and when the stress is more uniform, except its length, the other parameters are proportional to the difference value of surrounding rock settlement. The order of influence from large to small is as follows: extrapolation angle, catheter spacing, conduit diameter cable element simulation, the influence of each parameter from big to small is as follows: conduit layout range, extrapolation angle, duct length, arrangement spacing, The diameter of ducts. 3) the value of E, 蠁 t is proportional to the difference value of surrounding rock settlement, and the increase of E is in the premise of the increase of c and 蠁, the control of the settlement of surrounding rock is obvious c, and the increase of 蠁 has its upper limit value. The variation of Poisson's ratio has little effect on the settlement of surrounding rock, and can be ignored. Each relation formula is programmed by C language. The program can calculate the relative design parameters of advance support according to the difference value of settlement which needs to be controlled by the user, and it is convenient and quick to calculate and apply. The research results of this paper are applied to practical engineering, and the reliability of the application program is verified, which can provide a reference and design basis for the design of the parameters and the determination of the construction scheme of the leading small pipe grouting.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張朋;李曉紅;盧義玉;康勇;周東平;;小導(dǎo)管注漿技術(shù)在淺埋富水巖溶隧道中的應(yīng)用[J];地下空間與工程學(xué)報(bào);2008年03期

2 李斌;漆泰岳;高波;曠文濤;;新意法(巖土控制變形工法)概述[J];公路隧道;2009年02期

3 石鈺鋒;陽(yáng)軍生;楊峰;王樹(shù)英;;軟弱地層淺埋隧道加固范圍及強(qiáng)度參數(shù)的研究[J];公路交通科技;2014年05期

4 翟進(jìn)營(yíng);楊會(huì)軍;王莉莉;;新意法隧道設(shè)計(jì)施工概述[J];隧道建設(shè);2008年01期

5 翟進(jìn)營(yíng);唐靜;;新意法在法國(guó)里昂—馬賽高速鐵路Tartaiguille隧道建設(shè)中的應(yīng)用[J];隧道建設(shè);2009年02期

6 J.Oke;N.Vlachopoulos;M.S.Diederichs;;Numerical analyses in the design of umbrella arch systems[J];Journal of Rock Mechanics and Geotechnical Engineering;2014年06期

7 高潔;;雙層注漿小導(dǎo)管在軟弱地質(zhì)隧道進(jìn)洞施工中的應(yīng)用[J];鐵道建筑;2008年07期

8 周興國(guó);高永濤;盧宏建;韓曉強(qiáng);;超前注漿小導(dǎo)管支護(hù)機(jī)理與效果分析[J];西安建筑科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年04期

9 陳濤;梅志榮;李傳富;;隧道玻璃纖維錨桿全斷面預(yù)加固技術(shù)的應(yīng)用研究[J];現(xiàn)代隧道技術(shù);2008年S1期

10 師曉權(quán);張志強(qiáng);李化云;;軟弱圍巖隧道超前預(yù)加固技術(shù)試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2011年09期

相關(guān)碩士學(xué)位論文 前3條

1 胡斌;丁家山軟弱破碎圍巖隧道管棚預(yù)支護(hù)效應(yīng)研究[D];華中科技大學(xué);2011年

2 李河玉;小導(dǎo)管注漿技術(shù)及在隧道和地下工程中的應(yīng)用[D];西南交通大學(xué);2002年

3 王鵬飛;淺埋暗挖隧道注漿超前支護(hù)模擬研究[D];西安科技大學(xué);2012年

，

本文編號(hào)：1788251